package com.example.demobk.config;

import com.example.demobk.common.AjaxResult;
import com.fasterxml.jackson.databind.ObjectMapper;
import lombok.SneakyThrows;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.MethodParameter;
import org.springframework.http.MediaType;
import org.springframework.http.server.ServerHttpRequest;
import org.springframework.http.server.ServerHttpResponse;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.servlet.mvc.method.annotation.ResponseBodyAdvice;

/*
* 实现统一数据返回的保底类
*
* */
@ControllerAdvice
public class ResonseAdvice implements ResponseBodyAdvice {
    @Autowired
    private ObjectMapper objectMapper;
    @Override
    public boolean supports(MethodParameter returnType, Class converterType) {
        return true;
    }

    @SneakyThrows
    @Override
    public Object beforeBodyWrite(Object body, MethodParameter returnType, MediaType selectedContentType, Class selectedConverterType, ServerHttpRequest request, ServerHttpResponse response) {
        if (body instanceof AjaxResult) return body;
        if (body instanceof String){
            /*
            * 将string转为json
            * */
           return  objectMapper.writeValueAsString(AjaxResult.success(body));

        }
        /*
        * json不用转
        * */
        return AjaxResult.success(body);

    }
}
